Test S+isyncs

Run S+isyncs in model, using ppcmem

PPC S+isyncs
"ISyncdWW Rfe ISyncdRW Wse"
Cycle=Rfe ISyncdRW Wse ISyncdWW
{
0:r2=x; 0:r4=y;
1:r2=y; 1:r4=x;
}
 P0           | P1           ;
 li r1,2      | lwz r1,0(r2) ;
 stw r1,0(r2) | isync        ;
 isync        | li r3,1      ;
 li r3,1      | stw r3,0(r4) ;
 stw r3,0(r4) |              ;
exists
(x=2 /\ 1:r1=1)